Was working on setting up a new Central Site for a client today and noticed what appears to be a bug in the pre-req checker. This was building a new site server on Server 2008 R2 with SQL 2008 R2 from ConfigMgr SP2 media. I wanted to run the pre-req checker before launching the install and received the following error talking about the SQL Sysadmin rights.
I double-checked everything and was still sure I had everything correct. On a whim, I decided to launch the ConfigMgr install to see if I still received the same error. Lo and behold the error no longer surfaced on the box, without any changes having been made.
Hope this helps someone else from pulling their hair out!